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annotate xml/ru/docs/stream/ngx_stream_upstream_hc_module.xml @ 1950:ef22a80a2696

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Described the "checking" state in "health_check mandatory"
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 30 Mar 2017 21:26:44 +0300
parents 8f9c685dfabd
children f069d4b7a8df
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Модуль ngx_stream_upstream_hc_module"
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10 link="/ru/docs/stream/ngx_stream_upstream_hc_module.html"
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11 lang="ru"
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12 rev="4">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_stream_upstream_hc_module</literal> (1.9.0)
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18 позволяет активировать периодические проверки работоспособности серверов в
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19 <link doc="ngx_stream_upstream_module.xml" id="upstream">группе</link>.
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20 Группа должна находиться в
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21 <link doc="ngx_stream_upstream_module.xml" id="zone">зоне разделяемой памяти</link>.
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22 </para>
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23
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24 <para>
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25 Если проверка работоспособности была неуспешной,
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26 то сервер признаётся неработоспособным.
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27 Если для группы задано несколько проверок,
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28 то при любой неуспешной проверке соответствующий сервер будет
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29 считаться неработоспособным.
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30 На неработоспособные серверы и серверы в состоянии “checking”
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31 клиентские соединения передаваться не будут.
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32 </para>
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33
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34 <para>
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35 <note>
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36 Модуль доступен как часть
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37 <commercial_version>коммерческой подписки</commercial_version>.
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38 </note>
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="example" name="Пример конфигурации">
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45
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46 <para>
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47 <example>
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48 upstream tcp {
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49 zone upstream_tcp 64k;
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50
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51 server backend1.example.com:12345 weight=5;
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52 server backend2.example.com:12345 fail_timeout=5s slow_start=30s;
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53 server 192.0.2.1:12345 max_fails=3;
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54
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55 server backup1.example.com:12345 backup;
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56 server backup2.example.com:12345 backup;
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57 }
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58
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59 server {
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60 listen 12346;
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61 proxy_pass tcp;
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62 health_check;
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63 }
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64 </example>
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65 Для каждого сервера группы <literal>backend</literal>
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66 с интервалом в 5 секунд проверяется возможность установки TCP-соединения.
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67 Если соединение с сервером не может быть установлено,
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68 проверка считается неуспешной и сервер
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69 признаётся неработоспособным.
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70 </para>
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71
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72 <para>
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73 Проверки работоспособности могут тестировать данные, полученные от сервера.
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74 Тесты настраиваются отдельно при помощи директивы <link id="match"/>
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75 и указываются в параметре <literal>match</literal> директивы
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76 <link id="health_check"/>.
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77 </para>
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78
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79 </section>
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80
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81
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82 <section id="directives" name="Директивы">
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83
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84 <directive name="health_check">
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85 <syntax>[<value>параметры</value>]</syntax>
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86 <default/>
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87 <context>server</context>
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88
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89 <para>
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90 Активирует периодические проверки работоспособности серверов в
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91 <link doc="ngx_stream_upstream_hc_module.xml" id="upstream">группе</link>.
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92 </para>
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93
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94 <para>
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95 Могут быть заданы следующие необязательные параметры:
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96 <list type="tag">
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97
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98 <tag-name id="health_check_interval">
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99 <literal>interval</literal>=<value>время</value>
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100 </tag-name>
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101 <tag-desc>
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102 задаёт интервал между двумя последовательными проверками,
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103 по умолчанию 5 секунд.
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104 </tag-desc>
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105
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106 <tag-name id="health_check_jitter">
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107 <literal>jitter</literal>=<value>время</value>
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108 </tag-name>
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109 <tag-desc>
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110 задаёт время, в пределах которого
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111 случайным образом задерживается каждая проверка,
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112 по умолчанию задержки нет.
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113 </tag-desc>
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114
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115 <tag-name id="health_check_fails">
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116 <literal>fails</literal>=<value>число</value>
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117 </tag-name>
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118 <tag-desc>
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119 задаёт число последовательных неуспешных проверок для определённого сервера,
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120 после которых сервер будет считаться неработоспособным,
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121 по умолчанию 1.
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122 </tag-desc>
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123
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124 <tag-name id="health_check_passes">
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125 <literal>passes</literal>=<value>число</value>
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126 </tag-name>
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127 <tag-desc>
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128 задаёт число последовательных успешных проверок для определённого сервера,
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129 после которых сервер будет считаться работоспособным,
1891
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130 по умолчанию 1.
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131 </tag-desc>
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132
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133 <tag-name id="health_check_mandatory">
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134 <literal>mandatory</literal>
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135 </tag-name>
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136 <tag-desc>
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137 устанавливает исходное состояние “checking” для сервера
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138 до завершения первой проверки работоспособности (1.11.7).
1950
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139 На серверы в состоянии “checking” клиентские соединения передаваться не будут.
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140 Если параметр не указан,
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141 то исходно сервер будет считаться работоспособным.
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142 </tag-desc>
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143
1949
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144 <tag-name id="health_check_match">
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145 <literal>match</literal>=<value>имя</value>
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146 </tag-name>
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147 <tag-desc>
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148 указывает на блок <literal>match</literal> с условиями, которым должно
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149 удовлетворять соединение, чтобы результат проверки считался успешным.
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150 По умолчанию для TCP проверяется
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151 лишь возможность установки TCP-соединения с сервером,
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152 для <link id="health_check_udp">UDP</link> проверяется отсутствие
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153 сообщения ICMP “<literal>Destination Unreachable</literal>”
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154 в ответ на отправленную строку “<literal>nginx health check</literal>”.
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155 <note>
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156 До версии 1.11.7 по умолчанию для UDP
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157 требовалось наличие блока <link id="hc_match">match</link> с параметрами
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158 <link id="match_send">send</link> и <link id="match_expect">expect</link>.
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159 </note>
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160 </tag-desc>
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161
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162 <tag-name id="health_check_port">
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163 <literal>port</literal>=<value>число</value>
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164 </tag-name>
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165 <tag-desc>
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166 задаёт порт, используемый при подключении к серверу
1891
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parents: 1866
diff changeset
167 для проверки его работоспособности (1.9.7).
1947
6b6d0e844bf7 Moved "health_check" and "match" to ngx_stream_upstream_hc_module.
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parents: 1925
diff changeset
168 По умолчанию совпадает с портом
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169 <link doc="ngx_stream_upstream_module.xml" id="server">сервера</link>.
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170 </tag-desc>
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171
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172 <tag-name id="health_check_udp">
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173 <literal>udp</literal>
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174 </tag-name>
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175 <tag-desc>
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176 указывает, что для проверки работоспособности будет использоваться протокол
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177 <literal>UDP</literal>
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178 вместо протокола <literal>TCP</literal>, используемого по умолчанию (1.9.13).
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179 </tag-desc>
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180
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181 </list>
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182 </para>
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183
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184 </directive>
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185
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186
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187 <directive name="health_check_timeout">
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188 <syntax><value>время</value></syntax>
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189 <default>5s</default>
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190 <context>stream</context>
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191 <context>server</context>
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192
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193 <para>
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194 Переопределяет значение
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195 <link doc="ngx_stream_proxy_module.xml" id="proxy_timeout"/>
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196 для проверок работоспособности.
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197 </para>
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198
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199 </directive>
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200
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201
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202 <directive name="match">
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203 <syntax block="yes"><value>имя</value> </syntax>
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204 <default/>
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205 <context>stream</context>
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206
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207 <para>
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208 Задаёт именованный набор тестов для для анализа ответов сервера
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209 на запросы проверки работоспособности.
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210 </para>
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211
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212 <para>
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213 Могут быть заданы следующие параметры:
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214 <list type="tag">
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215
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216 <tag-name id="match_send">
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217 <literal>send</literal> <value>строка</value>;
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218 </tag-name>
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219 <tag-desc>
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220 отправляет <value>строку</value> на сервер;
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221 </tag-desc>
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222
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223 <tag-name id="match_expect">
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224 <literal>expect</literal> <value>стока</value> |
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225 <literal>~</literal> <value>regex</value>;
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226 </tag-name>
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227 <tag-desc>
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228 текстовая строка (1.9.12) или регулярное выражение,
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229 которым должны соответствовать данные, полученные с сервера.
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230 Регулярное выражение задаётся либо с модификатором
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231 “<literal>~*</literal>” (для поиска совпадения без учёта регистра символов),
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232 либо с модификатором “<literal>~</literal>” (с учётом регистра).
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233 </tag-desc>
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234
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235 </list>
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236 Параметры <literal>send</literal> и <literal>expect</literal>
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237 могут содержать строки в шестнадцатеричном виде
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238 с префиксом “<literal>\x</literal>”
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239 и последующими двумя шестнадцатеричными цифрами,
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240 например “<literal>\x80</literal>” (1.9.12).
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241 </para>
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242
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243 <para>
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244 Проверка работоспособности считается успешной, если
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245 <list type="bullet">
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246 <listitem>
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247 TCP-соединение успешно установлено;
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248 </listitem>
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249
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250 <listitem>
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251 <value>строка</value> из параметра <literal>send</literal>
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252 была отправлена (если была задана);
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253 </listitem>
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254
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255 <listitem>
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256 данные, полученные от сервера, совпали со строкой или регулярным выражением
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257 из параметра <literal>expect</literal> (если был задан);
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258 </listitem>
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259
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260 <listitem>
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261 истёкшее время не превышает значение, указанное
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262 в директиве <link id="health_check_timeout"/>.
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263 </listitem>
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264
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265 </list>
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266 </para>
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267
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268 <para>
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269 Пример:
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270 <example>
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271 upstream backend {
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272 zone upstream_backend 10m;
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273 server 127.0.0.1:12345;
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274 }
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275
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276 match http {
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277 send "GET / HTTP/1.0\r\nHost: localhost\r\n\r\n";
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278 expect ~ "200 OK";
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279 }
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280
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281 server {
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282 listen 12346;
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283 proxy_pass backend;
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284 health_check match=http;
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285 }
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286 </example>
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287 </para>
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288
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289 <para>
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290 <note>
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291 Проверяются лишь первые байты данных
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292 <link doc="ngx_stream_proxy_module.xml" id="proxy_buffer_size"/>,
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293 полученные от сервера.
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294 </note>
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295 </para>
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296
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297 </directive>
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298
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299 </section>
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300
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301 </module>